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发明名称
Educational aid
摘要
申请公布号
GB2129596(A)
申请公布日期
1984.05.16
申请号
GB19830028594
申请日期
1983.10.26
申请人
JOHN * SLEVIN
发明人
JOHN * SLEVIN
分类号
G09B23/18;(IPC1-7):G09B23/18
主分类号
G09B23/18
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